Detoxification of sugarcane bagasse hemicellulosic hydrolysate with ion‐exchange resins for xylitol production by calcium alginate‐entrapped cells

This study describes the performance of four different resins, in sequence, to detoxify sugarcane bagasse hemicellulosic hydrolysate and to improve xylitol production by calcium alginate‐entrapped Candida guilliermondii FTI20037 cells under conditions of low oxygen concentration. The treatment resulted in a removal of 82.1% furfural, 66.5% hydroxymethylfurfural, 61.9% phenolic compounds derived from lignin degradation, 100% chromium, 46.1% zinc, 28.5% iron, 14.7% sodium and 3.5% nickel. On the other hand, the removal of acetic acid was not significant. A xylitol yield factor (YP/S) of 0.62 g g−1 and a volumetric productivity (Qp) of 0.24 g dm−3 h−1 were attained in the fermentation process for xylitol production from detoxified hydrolysate.